msDeepKeymix

msDeepKeymix is a plugin that has the same functionality as a regular KeyMix node, but works with deep images. The only other difference is that all channels will be mixed by the given mask, i.e. you can't limit the operation to specific channels and pipe the other channels through unchanged.

Note: The download package contains the binaries for several versions of Nuke on Windows. If you would like to compile the plugin for a different version of Nuke or another operating system, you can download the source code from GitHub.